Here you can learn about Python general-purpose scripting language implemented in Java. Tutorials for beginners is designed for middle school students and everyone who is not familiar how to program. The "Python tutorial" is interactive and you need Java (thus it is called "Jython"). Jython is a Java implementation of Python that combines expressive power to import any Java class and method. How to run Java in your browser is explained in the article How to Run Java in Your Browser.